The latest version of the 45RS with the the 7.3mm crankpin & bushed front housing. The engine has a longer stroke than the 45Evo engines and delivers a lot more revs. A twin ballraced supported cranshaft & larger transfer ports. Engine is quite happy to run on 10% nitro but for best performance 16% to 25% nitro is recommended.
4.5HP at 31,000 rpm.
Bore 21.8mm
Stroke 20.0 mm.
Displacement 7.46cc
Note
Engine spares still available for the 45 Evo & 45 Evo 2/2 models.
No crank spares for the 7.2mm 2/2 crank rebuild.